Construction block



FIG. 1 is a view of the construction block from above;

FIG. 2 is a left side view of the construction block;

FIG. 3 is a frontal view of the construction block;

FIG. 4 is a right side view of the construction block;

FIG. 5 is a bottom view of the construction block; and,

FIG. 6 is a rear view of the construction block. 

The ornamental design for a construction block, as shown. 